Troubleshoot
Debugging Applications
Kubernetes provides tools to help troubleshoot and debug problems with applications.
Usually is getting familiar with how primitives objects interact with each other, checking the status of objects, and finally checking logs for any last resource clues.
Resources
OpenShift
IKS
References
Broken setup to debug
curl -sL https://gist.githubusercontent.com/csantanapr/e823b1bfab24186a26ae4f9ec1ff6091/raw/1e2a0cca964c7b54ce3df2fc3fbf33a232511877/debugk8s.64 | base64 -d | oc apply -f -
Expose the service using port-forward
oc port-forward service/my-service 8080:80 -n debug
Try to access the service
curl http://localhost:8080
Try Out these Commands to Debug
oc get pods --all-namespaces
oc get deployments
oc describe pod
oc explain Pod.spec.containers.resources.requests
oc explain Pod.spec.containers.livenessProbe
oc edit deployment
oc logs
oc get service
oc get ep
oc describe service
oc get pods --show-labels
oc get deployment --show-labels
Broken setup to debug
curl -s https://gist.githubusercontent.com/csantanapr/e823b1bfab24186a26ae4f9ec1ff6091/raw/a92550dd499ebefc205fa2cd5c18123409186712/debugk8s.64 | base64 -d | kubectl apply -f -
Expose the service using port-forward
kubectl port-forward service/my-service 8080:80 -n debug
Try to access the service
curl http://localhost:8080
Try Out these Commands to Debug
kubectl get pods --all-namespaces
kubectl get deployments
kubectl describe pod
kubectl explain Pod.spec.containers.resources.requests
kubectl explain Pod.spec.containers.livenessProbe
kubectl edit deployment
kubectl logs
kubectl get service
kubectl get ep
kubectl describe service
kubectl get pods --show-labels
kubectl get deployment --show-labels
Solution
Activities
The continuous integration activities focus around Tekton the integration platform. These labs will show you how to build pipelines and test your code before deployment.
| Task | Description | Link |
|---|---|---|
| Try It Yourself | ||
| Debugging | Find which service is breaking in your cluster and find out why. | Debugging |